41. A researcher determines the amount of sleep for each child by interviewing the children's parents. Then the researcher watches the children in the classroom to obtain measurements of their level...

41.

A researcher determines the amount of sleep for each child by interviewing the children's parents. Then the researcher watches the children in the classroom to obtain measurements of their level of attention. The researcher hopes to demonstrate that amount of sleep is related to attention level. This researcher is using a research strategy.

a. descriptive

b. correlational

C. experimental

d. scientific